Process of forming armor-plate.



F. CONLIN.

PROCESS OF FORMING ARMOR PLATE.

APPLICATION FILED JUNE 25. 1913.

1 ,186, 1 72. Patented-June 6, 1916.

UNITED STATES PATENT OFFICE.

FREDERICK CONLIN, 0F PLAINFIELD, NEW JERSEY.

PROCESS OF FORMING ARMOR-PLATE.

To all whom it may concern:

Be it known that I, FREDERICK CONLIN, of Plainfield, in the county of Union, and in the State of New Jersey, have invented a certain new and useful Improvement in Processes of Forming Armor-Plate, and do hereby declare that the followingis a full, clear, and exact description thereof.

My invention relates to a process of forming armor plate and has for its object to harden metal by means of a chill at a low cost of manufacture.

Other and further objects of my invention will be apparent from the following description thereof.

For purposes of illustration one manner of carrying out my process is shown in the accompanying drawing, wherein the figure illustrates a section taken through a mold showing the hardening of a body of metal by my process.-

In the illustrated embodiment, reference character A indicates a chill of any desired type adapted to abstract heat from, and thereby chill and harden a body of metal cast thereon.

Reference character B indicates a flask or a pit in the foundry floor, adapted to contain sand C in which is formed a mold or cavity D of desired shape. Instead of casting the metal to be hardened directly on chill A, a plate or casting E is placed over the face of the chill, and the metal to be hardened is cast on said plate. In the present embodi ment, the plate E preferably is of metal softer and of higher melting point than the metal F cast thereon, as, for example, lowcarbon steel such as mild steel or Swedish iron. The metal F cast on said plate E, preferably is of metal harder and of lower melting point than the plate E, as, for example, iron having suflicient carbon to produce these qualities. The face of the chill may be machined or not, and a cope used or not, as conditions require or as may be deemed necessary or advisable.

In operation, the cast metal F is chilled rapidly and hardened by the abstraction of its heat by chill A through plate E, and the heat of the molten cast metal F causes plate E to become sufliciently soft and pasty to tend to cause it to adhere to and unite with casting F. In order to insure a positive union, however, plate E-may be provided with projections such as bolts G, which becoming embedded in the cast metal Specification of Letters Patent.

Patented June 6, 1916.

Application filed June 25, 1913. Serial No. 775,626.

F, will secure together firmly the two bodies of metal. It is obvious that other securing devices may be used for this purpose. The completed plate, among other uses, is particularly adapted for use as armor plate, in which case the plate or casting E forms the outer or exposed surface. The body of hardened metal F prevents the penetration of a projectile, and the plate E of com paratively soft metal serves as a deflector or lubricant if the projectile strikes at an angle. If struck squarely by a projectile, the soft metal plate E tends to hold together the body of hardened metal F and prevent it from cracking, shattering, or disintegrating. -It will be understood that the principles above stated may be adapted tospecial conditions. For example, instead of using a plate E as above described, there could be employed a mild steel casting, particularly in cases where the shape of the completed plate is such as to make it impracticable to form the plate to suit the shape desired, such as curved or rounded plates of conical or other forms.

Many modifications and adaptations of my process will be apparent to those skilled in the art without departing therefrom or from the scope of the claims, the process contemplating the hardening of a body of metal by means of a chill acting through an interposing shield or plate adapted to protect and preserve the chill, and also the casting in connection with a chill of harder metal upon a softer metal.

Having described my invention, what I claim and desire to protect by Letters Patent of the United States is as follows:

1. The process of forming armor plate comprising covering the face of a chill with a layer of metal and pouring a relatively harder metal on said layer of metal.

2. The process of forming armor plate comprising covering the face of a chill with a layer of metal and pouring a relatively higher carbon metal on said layer of metal.

3. The process of forming armor plate comprising covering the face of a chill with a layer of metal and pouring a metal having a relatively lower melting point on said layer of metal.

4. The process of forming armor plate comprising covering the face of a chill with a plate of metal and pouring a relatively harder metal on said plate.

5. The process of forming armor plate comprising covering the face of a chill with a plate of metal and pouring a relatively higher carbon metal on said plate.

6. The process of forming armor plate comprising covering the face of a chill with a plate of metal and pouring a metal having a relatively lower melting point on said body of metal.

7. The process of forming armor plate comprising covering the face of a chill with a plate of metal and pouring cast iron on said plate.

8. The process of forming armor plate comprising covering the face of a chill with a layer of soft metal and pouring metal on said layer.

9. The process of forming armor plate comprising covering the face of a chill with a layer of low carbon metal and pouring metal on said layer.

10. The process of forming armor plate comprising covering the face of a chill with a plate of soft metal and said layer.

11. The process of forming armor plate comprising covering the face of a chill with a plate of lOW carbon metal and pouring metal on said plate.

12. The process of forming armor, plate comprising covering the face of a chillwith a plate of low carbon steel, securing fastening means in said plate which project therefrom, and pouring cast iron upon said sheet and around said fastening means.

13. The process of forming armor plate by chilling molten metal through an interposing plate of metal having a relatively higher melting point than said molten metal.

In testimony that I claim the foregoing I have hereunto set my hand.

FRED. CONLIN.

Witnesses:

GEORGE L. VVODEY, E. C. HAND.

pouring metal on 

